| Description | Date | Identifier | |
| Letter from a consulting engineer regarding an enquiry into the material Textolite for Buick Timing Gears. | 26th Jun 1933 | Box 136 \ 1 scan0054 | |
| Letter from The British Thomson-Houston Company regarding the manufacturing process of Textolite and Fabroil-A timing gears. | 21th Jun 1933 | Box 136 \ 1 scan0055 | |
| Letter from a consulting engineer regarding 'Textolite', enclosing clarifying correspondence from another company. | 30th Jun 1933 | Box 136 \ 1 scan0056 | |
| Letter from The British Thomson-Houston Company Ltd. clarifying that their material Fabroil-A is identical to Textolite. | 27th Jun 1933 | Box 136 \ 1 scan0057 | |
| Supply of a modified hub for a Fabroil Gear from the British Thomson-Houston Co. | 4th Jul 1933 | Box 136 \ 1 scan0058 | |
| Alternative schemes for quieting Bentley timing gears. | 8th Jul 1933 | Box 136 \ 1 scan0059 | |
| Confirming the programme for testing different timing gears on various cars and units. | 17th Jul 1933 | Box 136 \ 1 scan0060 | |
| Experimental design for quietening the Bentley timing gears camshaft drive. | 19th Jul 1933 | Box 136 \ 1 scan0061 | |
| Timing gear rattles on the 20/25 HP model and related experiments on Bentley cars. | 21th Jul 1933 | Box 136 \ 1 scan0062 | |
| Experimental engine timing gears for a B.I. unit, specifically a special cam wheel with a damped spring drive. | 21th Jul 1933 | Box 136 \ 1 scan0063 | |
| Persistent problem of gear rattles in the 25HP engine. | 21th Jul 1933 | Box 136 \ 1 scan0064 | |
| Requesting a set of custom valve springs for engine gear rattle experiments. | 26th Jul 1933 | Box 136 \ 1 scan0065 | |
| Letter to the Ford Motor Co. Ltd. proposing a visit to discuss their experience with Textolite timing gears. | 28th Jul 1933 | Box 136 \ 1 scan0066 | |
| Confirming the fitting of high-rating valve springs to address a 20/25 engine gear rattle complaint. | 1st Aug 1933 | Box 136 \ 1 scan0067 | |
| The performance and issues of non-metallic gears in 4-litre, 8-litre, and 6.5-litre engines. | 29th Jul 1933 | Box 136 \ 1 scan0068 | |
| Letter from Ford Motor Company to Rolls-Royce regarding a plant visit. | 2nd Aug 1933 | Box 136 \ 1 scan0069 | |
| Engine gear rattle on Bentley and 20/25 models, detailing investigations and potential solutions. | 2nd Aug 1933 | Box 136 \ 1 scan0070 | |
| Outlining the programme of experiments for investigating timing gear rattles. | 2nd Aug 1933 | Box 136 \ 1 scan0071 | |
| Letter to Ford Motor Co. Ltd. to postpone a visit to their Dagenham works. | 3rd Aug 1933 | Box 136 \ 1 scan0072 | |
| Urgent memo regarding a modification to Bentley Timing Gears to address rattles. | 4th Aug 1933 | Box 136 \ 1 scan0073 | |
| Letter from Ford Motor Company regarding arrangements for a factory visit. | 4th Aug 1933 | Box 136 \ 1 scan0074 | |
| Letter to the Ford Motor Co. arranging a visit and expressing interest in trying a Lincoln 12-cylinder car. | 5th Aug 1933 | Box 136 \ 1 scan0075 | |
| Letter from the Ford Motor Company arranging a works visit and trial of a Lincoln 12-cylinder car. | 8th Aug 1933 | Box 136 \ 1 scan0076 | |
| Letter to Ford Motor Company confirming a visit to their Dagenham factory and the trial of a Lincoln car. | 30th Aug 1933 | Box 136 \ 1 scan0077 | |
| Visit to Dagenham to investigate the testing and use of Textolite timing gears. | 2nd Sep 1933 | Box 136 \ 1 scan0078 | |
| Producing quiet gears using the cyanide hardening process and its advantages. | 2nd Sep 1933 | Box 136 \ 1 scan0079 | |
| Thank-you letter to the Ford Motor Company for a factory visit and information on Textolite timing gears. | 2nd Sep 1933 | Box 136 \ 1 scan0080 | |
| Calculations for the helix angle and overlap of Bensport timing gears. | 30th Aug 1933 | Box 136 \ 1 scan0081 | |
| Visit to Dagenham to investigate Ford's Textolite timing gears and manufacturing processes. | 6th Sep 1935 | Box 136 \ 1 scan0082 | |
| Comparing a car's performance against a Lincoln and a Cadillac, objecting to the purchase of the Lincoln for benchmarking. | 6th Sep 1933 | Box 136 \ 1 scan0083 | |
| Internal memorandum requesting an order for one dozen fabric gear blanks from Messrs Atwood. | 6th Sep 1933 | Box 136 \ 1 scan0084 | |
| Engine gear repairs and service updates for 20/25 HP cars. | 16th Sep 1933 | Box 136 \ 1 scan0085 | |
| Letter regarding engine gear issues in three 20/25 HP cars, highlighting the reputational damage in the Dundee community. | 15th Sep 1933 | Box 136 \ 1 scan0086 | |
| Letter from a dealer complaining about engine noise in multiple new 20/25 HP chassis and the negative impact on business. | 13th Sep 1933 | Box 136 \ 1 scan0087 | |
| Follow-up letter regarding the trial of Fabroil moulded cam-shaft gear blanks supplied by The British Thomson-Houston Co. | 18th Sep 1933 | Box 136 \ 1 scan0088 | |
| From E. to ROY. discussing the continued experimentation with Fabroil gears as an alternative to standard metal gears. | 19th Sep 1933 | Box 136 \ 1 scan0089 | |
| Investigation into the cause of engine gear whine on a Bentley No. B.5 engine. | 19th Sep 1933 | Box 136 \ 1 scan0090 | |
| Analysis of the causes of engine gear whine, focusing on idler wheel bedding and crankcase alignment. | 19th Sep 1933 | Box 136 \ 1 scan0091 | |
| The weaknesses of the 20/25 HP engine gears, which cause a rattle, and proposed solutions. | 19th Sep 1933 | Box 136 \ 1 scan0092 | |
| Performance, testing, and potential hardening processes for timing gears. | 21th Sep 1933 | Box 136 \ 1 scan0093 | |
| Letter to the Ford Motor Company enquiring about a cyanide hardening process and requesting to purchase a finished gear for investigation. | 22th Sep 1933 | Box 136 \ 1 scan0094 | |
| Letter from Ford Motor Company acknowledging a query regarding a cyanide hardening process. | 25th Sep 1933 | Box 136 \ 1 scan0095 | |
| Letter from Ford Motor Company describing their cyanide hardening process for steel parts. | 26th Sep 1933 | Box 136 \ 1 scan0096 | |
| Proposal for timing gear tests on Bentley units, comparing standard and Textolite gears. | 27th Sep 1933 | Box 136 \ 1 scan0097 | |
| Letter to the Ford Motor Company regarding observations on cyanide hardening. | 27th Sep 1933 | Box 136 \ 1 scan0098 | |
| Letter to Ford Motor Co. Ltd. regarding cyanide hardened gear and noting the lack of a patent for the process. | 28th Sep 1933 | Box 136 \ 1 scan0099 | |
| Delaying a report on B.T.H. Fabroil gear blanks. | 6th Oct 1933 | Box 136 \ 1 scan0100 | |
| Suitability of steel used in a gear supplied by the Ford Motor Co. | 12th Oct 1933 | Box 136 \ 1 scan0101 | |
| Timing gear trouble for car GHW-51 and a reminder to provide parts for a cam balancing scheme. | 20th Oct 1933 | Box 136 \ 1 scan0102 | |
| Tests on achieving quiet timing gears on a Bentley and the potential use of Textolite. | 24th Oct 1933 | Box 136 \ 1 scan0103 | |
| Engine gear whine tests performed on Bentley units B.7 and B.6. | 24th Oct 1933 | Box 136 \ 1 scan0104 | |
| Investigation into gear and pinion running issues, including bedding, lapping, and backlash problems. | 24th Oct 1933 | Box 136 \ 1 scan0105 | |
| Analysis of issues with gear and pinion mounting, bedding, and grinding on Units B.6 and B.7. | 24th Oct 1933 | Box 136 \ 1 scan0106 | |
| The preparation and testing results for experimental gears, detailing deposition processes and accuracy. | 24th Oct 1933 | Box 136 \ 1 scan0107 | |
| Diagrams illustrating the development and bedding of gear teeth. | 24th Oct 1933 | Box 136 \ 1 scan0108 | |
| Use of Textolite timing gears on a Bentley to reduce noise and production costs. | 26th Oct 1933 | Box 136 \ 1 scan0109 | |
| Fitting a Cam Balancer modification to chassis GHW-51 to cure engine gear rattle. | 4th Nov 1933 | Box 136 \ 1 scan0110 | |
| Introduction of a balancing cam on the 20/25 model and its effect on timing gear rattle. | 14th Nov 1933 | Box 136 \ 1 scan0111 | |
| Complaint case regarding engine gear rattles on chassis GHW-51, proposing the standardization of a Cam Balancer Scheme. | 16th Nov 1933 | Box 136 \ 1 scan0112 | |
| Requesting an urgent order for fabroil gear material from two named suppliers. | 23th Nov 1933 | Box 136 \ 1 scan0113 | |
| The trial and implementation of Textolite gears for the balanced cam and water pump drive. | 27th Nov 1933 | Box 136 \ 1 scan0114 | |
| List of special parts required for a Bentley Fabroil Camwheel and Water Pump Pinion. | 28th Nov 1933 | Box 136 \ 1 scan0115 | |
| Procuring Fabroil gears, noting that suppliers will provide plain blanks for subsequent machining. | 28th Nov 1933 | Box 136 \ 1 scan0116 | |
| Sourcing new material for Textolite timing gears for experimental tests. | 1st Dec 1933 | Box 136 \ 1 scan0117 | |
| 'Textolite' timing gear developments and blanks for the Bentley chassis. | 6th Dec 1933 | Box 136 \ 1 scan0118 | |
| Letter from The British Thomson-Houston Company regarding the production of Textolite timing gears. | 5th Dec 1933 | Box 136 \ 1 scan0119 | |
| Receipt of blanks for experiments on Textolite timing gears. | 11th Dec 1933 | Box 136 \ 1 scan0120 | |
| Desire to get Textolite timing gears running and a scheme to test them. | 21th Dec 1933 | Box 136 \ 1 scan0121 | |
| The performance and noise levels of engine gears after testing. | 9th May 1934 | Box 136 \ 1 scan0122 | |
| Proposal to produce and experimentally fit six sets of Texolite engine gears. | 4th Jun 1934 | Box 136 \ 1 scan0123 | |
| Methods and experiments for engine gear quieting on all chassis. | 16th Jul 1934 | Box 136 \ 1 scan0124 | |
| Engine gear quietening, detailing issues and providing suggestions for improvement. | 11th Dec 1933 | Box 136 \ 1 scan0125 | |
| Letter from The British Thomson-Houston Company Ltd querying the type of steel to be used for making moulds for Fabroil gears. | 30th Jul 1934 | Box 136 \ 1 scan0126 | |
| Letter to The Morse Chain Co. requesting a review of a chain drive scheme and supply of parts for testing. | 8th Oct 1934 | Box 136 \ 1 scan0127 | |
| Letter from Morse Chain Co. regarding a proposed duplex chain drive design, referencing blueprints. | 26th Oct 1934 | Box 136 \ 1 scan0128 | |
| Page 2 of a letter from Morse Chain Company to Mr. Robotham regarding parts for an experimental program. | 26th Oct 1934 | Box 136 \ 1 scan0129 | |
| Blueprint of a timing chain and sprocket arrangement for a 16-cylinder engine. | 9th Oct 1931 | Box 136 \ 1 scan0130 | |
| To the Order Office requesting the purchase of three sets of Sprockets and Chain Drive from Morse Chain Co. | 12th Nov 1934 | Box 136 \ 1 scan0131 | |
| Letter to The Morse Chain Co. in Detroit, ordering American sprockets and chains for comparative testing. | 12th Nov 1934 | Box 136 \ 1 scan0132 | |
| Procurement and comparative testing of chain drive parts for the Wraith front end. | 12th Nov 1934 | Box 136 \ 1 scan0133 | |
| The coarse finish of ground steel gears meshing with Textolite gears on a Bentley B-10 unit. | 15th Nov 1934 | Box 136 \ 1 scan0134 | |
| Letter from Morse Chain Co. requesting more detailed drawings for chain and sprockets to proceed with construction. | 23th Nov 1934 | Box 136 \ 1 scan0135 | |
| The second page of a letter from the Morse Chain Company to Mr. Robotham. | 23th Nov 1934 | Box 136 \ 1 scan0136 | |
| Use of a silent chain front end drive for the Wraith, comparing its performance to a Cadillac's. | 26th Nov 1934 | Box 136 \ 1 scan0137 | |
| Requesting detail drawings for parts from the Morse Chain Co. to be run on a rig. | 8th Dec 1934 | Box 136 \ 1 scan0138 | |
| Noisy Textolite timing gears and proposed testing on a test bed. | 1st Jan 1935 | Box 136 \ 1 scan0139 | |
| Letter to The Morse Chain Co. enclosing drawings for sprockets and a chain drive. | 21th Jan 1935 | Box 136 \ 1 scan0140 | |
| Letter from The Morse Chain Company regarding the application of their duplex chain for the Wraith front-end drive. | 29th Jan 1935 | Box 136 \ 1 scan0141 | |
| Internal request to order sprockets and chains from an English supplier for confirmatory testing. | 31th Jan 1935 | Box 136 \ 1 scan0142 | |
| Short communication forwarding a reply from the Morse Chain Co. Ltd. | 31th Jan 1935 | Box 136 \ 1 scan0143 | |
| Procurement of Morse Chain Drive parts for the Wraith model to produce sprockets for testing. | 12th Feb 1935 | Box 136 \ 1 scan0144 | |
| Letter from The Morse Chain Co. Ltd. responding to an enquiry about chains, discussing manufacturing processes and pricing. | 8th Feb 1935 | Box 136 \ 1 scan0145 | |
| Page 2 of a letter from The Morse Chain Company Ltd. regarding their inability to quote for sprockets. | 16th Feb 1935 | Box 136 \ 1 scan0146 | |
| Letter from Michigan Tool Company apologising for a delayed response and submitting a gear set design. | 16th Feb 1935 | Box 136 \ 1 scan0147 | |
| Blueprint detailing specifications for two sets of worm and gear assemblies. | 15th Feb 1935 | Box 136 \ 1 scan0148 | |
| Investigation into 'chunking in the drive', comparing slackness measurements between a Buick and a 5-B-IV model. | 26th Feb 1935 | Box 136 \ 1 scan0149 | |
| Letter from Gaston E. Marbaix Ltd. concerning a gear unit from Michigan Tool Company. | 2nd Mar 1935 | Box 136 \ 1 scan0150 | |
| Letter from Gaston E. Marbaix Ltd. concerning a blueprint for a 2 1/2' Center Gear set. | 2nd Mar 1935 | Box 136 \ 1 scan0151 | |
| Modifications and trials for Bentley timing gears to achieve quieter operation. | 4th Apr 1935 | Box 136 \ 1 scan0152 | |
| Requesting the construction of a rig for endurance testing the Spectre Timing Gears. | 8th Apr 1935 | Box 136 \ 1 scan0153 | |
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